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A particle travels along a straight line...

A particle travels along a straight line such that in 2s it moves from an initial position `x_(A)=+0.5m` to a position `x_(B)=-1.5m` .Then in another 4s it moves from `x_(B)` to `x_(C)+2.5m` Determine the particle's average speed,in `ms^(-1)` ,during the "6s" time interval.

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